diff --git a/README.md b/README.md index 37c9e14..b1277d3 100644 --- a/README.md +++ b/README.md @@ -25,13 +25,17 @@ ### FSK -Transmitting with +17 dBm, reception stopped with an RSSI of about -125 dBm at -almost 2.7 km distance - with simple wire antennas, and a low hill in between. +At almost 8 km distance line of sight, reception was stable with an RSSI of -98 dBm +and +15 dBm Tx power - with simple wire antennas. Quite impressive! -Compared to the [RFM69](https://github.com/gitdode/librfm) at +13 dBm, it does -make it a few hundred meters further - seems fair enough! +The configuration: -![FieldTest4](https://github.com/user-attachments/assets/67f745c4-a47f-4cb1-a278-547a0b0e01e3) +- LNA highest gain, boost on, 150% LNA current +- Modulation shaping Gaussian filter BT = 0.5 +- Transmitter frequency deviation: 10 kHz +- Receiver channel filter bandwith 20.8 kHz + +![FieldTest6](https://github.com/user-attachments/assets/7ba77a8e-1384-40ab-b151-372788e90d88) ### LoRa @@ -41,14 +45,14 @@ - LNA highest gain, boost on, 150% LNA current - Signal bandwidth: 41.7 kHz -- Error correction code rate: 4/5 - Spreading factor: 10 +- Error correction code rate: 4/5 - Low Data Rate Optimization ![FieldTest5](https://github.com/user-attachments/assets/7f1d0ec2-f95d-472f-9510-919c16c1f7f6) -So, LoRa seems to perform significantly better than FSK - as expected - but FSK -certainly can go a lot further than 2.7 km under similar conditions (plain line of sight). +So, as expected, range is significatly increased with LoRa, and the link is more robust +when there are obstacles in the path, such as buildings and terrain. Anyway, these radio modules work very well with both modulation schemes!